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In a recent volume of Mathematics Magazine (Vol. 90, No. 3, June 2017) thereis an interesting article by Seth Zimmerman, titled Detecting Deficiencies: AnOptimal Group Testing Algorithm. The claim in the summary is contradictory towell-known facts reported in the group- testing literature, which is easilyverified, beginning with the work by Sobel and Groll (1959), which was cited byS. Zimmerman himself. Therefore, I feel compelled to offer a number of commentsand clarifications. In addition, I have made some correction of mistaken claimmade by Zimmerman (2017).

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